High-temperature-resisting, anti-fluid-channeling and high-density well cementing slurry and its preparation method

A technology of cementing slurry and high temperature resistance, which is applied in the field of cementing slurry, and can solve the problem of not being able to effectively meet the technical requirements of preventing gas channeling, slow development of settlement stability and compressive strength, and not being able to meet the requirements of ultra-deep wells, etc. problems, to achieve excellent right-angle thickening, good flow properties, and slow compressive strength

Inactive Publication Date: 2017-12-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this kind of cement slurry is applied in an environment with a temperature higher than 180°C, its settlement stability and compressive strength develop slowly, or even super-retarded, which will easily lead to the decline of the compressive strength of the cement stone, and then Gas channeling and other technical problems
It can be seen that the existing high-temperature-resistant, anti-gas channeling, and high-density cementing cement slurry cannot effectively meet the technical requirements of preventing gas channeling in high-temperature environments, and cannot meet the use requirements of ultra-deep wells

Method used

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  • High-temperature-resisting, anti-fluid-channeling and high-density well cementing slurry and its preparation method
  • High-temperature-resisting, anti-fluid-channeling and high-density well cementing slurry and its preparation method
  • High-temperature-resisting, anti-fluid-channeling and high-density well cementing slurry and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 9

[0038] The preparation method of the present invention comprises the following steps:

[0039] Step 1. Prepare the raw material components according to the formula amount in the corresponding formula embodiment; prepare a mixing container with automatic stirring function;

[0040] Dry mix the oil well cement, weighting agent, silica powder, microsilica fume and suspension stabilizer in the formulated amount into a dry powder mixture, and mix well;

[0041] Dissolve the high-temperature water loss reducer, high-temperature retarder, dispersant, anti-air channeling agent and defoamer in the formulated amount in the formulated amount of water to form a mixed solution;

[0042] Step 2. Open the lid of the mixing container, put the mixed solution in the mixing container; start the mixing container, and make the mixing container rotate at a low speed for rotation and stirring. The rotation speed of the low speed rotation is 4000±200 rpm. Within 15 seconds, add the well-mixed dry po...

Embodiment 4

[0048] The experimental results of the cementing slurry that embodiment 4 and embodiment 9 make are shown in table 3 and figure 2 shown.

[0049] Table 3 Test performance table of cementing cement slurry with resistance to high temperature above 180°C, anti-gas channeling and high density prepared in Example 4 and Example 9

[0050] Test items

Experimental conditions

Test results

Industry Standard

Density, g / cm 3

2.1

2.08～2.12

Initial consistency, Bc

OWC-9380

18

＜30

40Bc~100Bc time, min

2

＜10

Thickening time, min

180℃×110MPa

495

＞300

Compressive strength, MPa

220℃×20.7MPa×72h

21

＞20

Water loss, mL / 30min

180℃×6.9MPa

35

＜100

Free solution, mL

90℃×2h

1

＜5

Sedimentation stability, g / cm 3

2h

0.005

＜0.02

[0051] The experimental results of the cementing slurry that embodiment 6 and embodiment 9 make are shown in table 4...

Embodiment 8

[0055] The experimental results of the cementing slurry that embodiment 8 and embodiment 9 make are shown in table 5 and Figure 4 shown.

[0056] Table 5 Test performance table of the high temperature resistance above 180°C, anti-gas channeling, high density cementing cement slurry prepared in Example 8 and Example 9

[0057] Test items

[0058] Through the above four test examples, it can be concluded that the high temperature resistance of the cement slurry of the present invention is above 180°C, the anti-gas channeling performance is strong, the density is high and the density adjustment range is 2.0-2.3g / cm 3 In addition, the cement slurry of the present invention has the characteristics of adjustable thickening time, good fluidity and small water loss. It can be seen that the cementing cement slurry of the present invention can fully meet the requirements of on-site cementing construction, has excellent "right-angle thickening" performance, SPN<3, and at the ...

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Abstract

The invention discloses a high-temperature-resisting, anti-fluid-channeling and high-density well cementing slurry and its preparation method, wherein the well cementing slurry is prepared from, by weight, 100 parts of oil well cement, 80-120 parts of weighting agent, 30-35 parts of silica powder, 3-6 parts of silica fume, 2-4 parts of suspension stabilizer, 6-10 parts of high-temperature fluid loss agent, 6-10 parts of high-temperature retarder, 1-2 parts of dispersing agent, 3-5 parts of anti-fluid-channeling agent, 1-2 parts of defoaming agent, and 55-65 parts of water. The high temperature resistance can reach 180-200DEG C, and the well cementing slurry is featured by good flowing property, low filter loss, good sedimentary stability, and strong anti-fluid-channeling performance, and the like.

Description

technical field [0001] The invention relates to well cementing slurry for oil and gas well development, in particular to a high-temperature-resistant, gas-channeling-proof, high-density cementing slurry and a preparation method of the cementing slurry. Background technique [0002] With the continuous deepening of oil exploration and development, the depth of the well gradually increases, and the pressure and temperature of the formation are getting higher and higher, which poses technical challenges to the cementing operation. The bottom temperature is greater than 150°C. For ultra-deep wells, the cementing slurry required for the cementing operation must have the characteristics of high temperature resistance, gas channeling prevention and high density. [0003] Most of the existing high-temperature-resistant, anti-gas channeling, and high-density cementing cement slurries are prepared by adding quartz sand to the cement slurry to improve the high temperature resistance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/48C09K8/493
Inventor 蒋祖军朱礼平严焱诚欧彪李早元张玉胜张兴国房舟郑冠一肖国益肖夏谭玮
Owner CHINA PETROLEUM & CHEM CORP
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